Not so rare, it is different than you think and the booked holiday has to
be canceled or terminated prematurely.
The right of withdrawal according to § 18 Abs. 1 Z 10 FAGG does not apply,
for the general terms and conditions apply with us for the hospitality
industry (http://www.hotelverband.at/down/AGBH_061115.pdf)

§ 5 of AGBH 2006:
Up to 1 month prior to arrival you can cancel free of charge. From 30 days
before arrival we charge 80% cancellation fee of the total price.
When you cancel during the last week before arrival we charge you 80% of
the price charged,
case of early departure 80%.
These unnecessary costs and hassles associated with it, we want to spare
you like. We strongly recommend that as a precaution for cancellation,
early departure and mountain rescue (incl. Helicopter rescue)